Electric motors



Feb. 7, 1961 K. K. 0.1m 2,971,107

ELECTRIC MOTORS Filed April 9, 1959 INVENTOR.

United States Patent ELECTRIC MOTORS Korda K. D. Jin, Elyria, Ohio, assignor to The General Industries Company, Elyria, Ohio, an Ohio company Filed Apr. 9, 1959, Ser. No. 805,196

4 Claims. (Cl. 310-239) My invention relates to improvements in motor brush mountings and relates more particularly to that type of mounting particularly adapted for use on ferro-magnetic type D.C. motor fields.

My invention further relates to improvements in brush holders and field piece retainers for such ferrite type fields.

It is an object of my invention to provide a brush holder construction which will be simple to manufacture, having but few parts and these adapted for easy assembly into operative position.

Another object of my invention is to provide brush mountings of the type referred to which will securely hold the ferrite field in assembled relation and which will at the same time be securely mounted within the motor housing as well as affording the brushes and brush holders secure relation with respect to the commutator.

A still further object of my invention is to provide brush and pole mountings of the type referred to which will be inexpensive to manufacture and highly efficient in use.

Still further objects of my invention and the invention itself will become more readily apparent from a purview of the following description in which description reference will be made to the accompanying drawings forming a part thereof, in which drawings:

Fig. 1 is an end plan view of a motor showing the holder support and mounting with the cover of the motor housing removed;

Fig. 2 is an end view similar to Fig. 1 of the motor brush mounting and ferrite field with the brush holder removed;

Fig. 3 is a sectional view taken from the line 33 of Fig.2;

Fig. 4 is a fragmentary view similar to the view of Fig. 2 showing the opposite end of the brush and field support means; and

Fig. 5 is a perspective view of one of a pair of motor brush and field support means.

Referring now to the drawings, in all of which like parts are designated by like reference characters, the motor 1 shown is a D.C. ferrite field type employing a pair of like commutator brushes 2, adapted to contact a commutator 30 disposed at one end of an armature 31. Said brushes are of a conventional type which is well known, are generally l-l-shaped in traverse cross-section, and are adapted to be slidingly fitted onto like elongated brush carriers 4, Fig. 1.

.A like pair of mounting brush supports and pole piece retainers 8, one of which is shown in Fig. 5 in perspective, are generally of T-shaped form in plan view and each comprise a T-bar 9 whose ends are bifurcated to provide oppositely extending notches 10 defined by end forks 11; the stems of the brush supports 8 are generally arcuately formed or bowed in transverse section and terminate in a necked-in portion 12 and immediately adjacent thereto and disposed below the same is provided "ice with a pair of reversely curved end hooks 13-13. The medial region of the stem is provided similarly with longitudinally extending wall portions 14-14 reversely bent relative to said bowed stem, and immediately beyond said edges 14-14 and spaced from the forks 11 are a pair of radially outwardly disposed relatively less curved arms 16-16, all of which curved hooks, edges, arms, etc. are provided for purposes to be later hereinafter more fully described.

The support and retainer means 8 shown herein is preferably formed of spring metal, so that when the same is wedged into the gap between adjacent spaced ferrite pole field pieces 2020, the edges 1414 and end hooks 13 13 are adapted to be springingly compressed so that the hook ends l313 may easily pass through the said opening and expand upon movement beyond the opposite end of the field to exert restraint against longitudinal movement of the field and its associated ring mounting 21, as best shown in Fig. 4; the edges 14-14 will thereafter exert a reactive outward effect upon the circumferentially directed edges of the field pieces.

The arms 1616 similarly to the ends 1313, also limit the longitudinal movement of the field 2G and its associated ring mounting 21, as best illustrated in Fig. 2.

The brush holders 44 are then mounted in the bifurcated ends of the T-bar 9 biased together by spring means '25 and interconnected thereby, and hence the brush supports 8 afford a secure mounting for the brushes 2, as well as a mounting and support for the field The motor housing H is preferably formed of two cup shaped halves having bearing support means associa ted therewith.

While I have described my invention in connection with a preferred embodiment thereof, I am aware that numerous and extensive departures may be made therefrom without, however, departing from the spirit of my invention and the scope of the appended claims, in which I claim:

1. Brush carrier support mechanism for electric motors of the type having a commutator at one end of a cen traily disposed armature and a field structure surrounding the said armature, said mechanism comprising a pair of substantially resilient T-shaped brush supports each rigidly afiixed by portions to diametrically opposite sides of said structure, said supports each having a T-bar bifurcated at either end thereof, said bars being disposed in substantial parallelism at relatively opposite sides of the commutator and said supports each having an arcuate stem portion and arcuate means disposed adjacent the T-bar and at the free end of the stem adapted to engage opposite end faces of said field structure, and longitudinally extending reversely bent edges of said arcuate stem portion of the support being shaped to exert reactive force on circumferentially disposed ends of the field structure.

2. A brush carrier support mechanism for electric motors of a type having a commutator at one end of a centrally disposed armature and a field structure surrounding said armature, said field structure divided into two portions with the substantially flat ends of one of said portions circumferentially spaced from the substantially fiat ends of the other of said portions, a pair of brush supports wedged between said spaced ends at diametrically opposite positions in said field structure, each said brush support comprising a transversely bowed, elongated stem having reversely curved longitudinal wall portions extending therefrom, said wall portions adapted for endwise pressure contact with said spaced fiat ends of said field portions to hold said portions in place, said stems extending beyond said field structure a substantial distance in the direction of said commutator and providing means on said extension for mounting brush holders.

3. A combined brush carrier and pole piece support of arcuate ferrite field pieces contained within a ring .support member, the ends of one of said field pieces being circumferentially spaced from the opposing ends of .the other of said field pieces, brush carrier and pole piece resilient supports disposed Within the space between pieces, each said support comprising an elongated stem,

vsaid stem being transversely bowed and having portions ,thereof extending laterally from said bow and bent oppositely from said bow to provide interspaced wall adjacent either end of said wall portions adapted to hook over end faces of said field pieces and said ring support whereby said brush carrier support is maintained against longitudinal movement, said stems extending substantially 4. A brush carrier support mechanism for a direct mechanism for a direct current motor comprising a pair jsaid opposed ends parallel with the axis of said field portions, said stern having laterally disposed arcuate arms beyond said field pieces in a common direction and hav- 1 ing means attlie end thereof for mounting brush carriers. o 2 t between said opposed ends parallel with the axis of said field pieces, each said support comprising an elongated stem, said stem being transversely bowed and having portions thereof extending laterally from said bow and bent oppositely from said bow to provide interspaced, outwardly laterally biased wall portions, said stem having a reduced diameter adjacent an end thereof, laterally disposed arms adjacent the said reduced end of said stern adapted to hook over end faces of adjacent of each pair of said field pieces and a pair of arcuately bowed laterally disposed arms adjacent an opposite end of said bowed stern adapted to seat upon opposite end faces of a pair of spaced adjacent field pieces, whereby said field pieces are maintained against axial or longitudinal movement, said stems extending substantially beyond said field pieces in a common direction and having means at the end thereof for mounting brush carriers.

. References Cited in the file of this patent UNITED STATES PATENTS 2,504,564 Merriam Apr. 18, 1950 2,513,227 Wylie June 27, 1950 2,535,004 Willits Dec. 19, 1950 Carneck Feb. 5, 1957 

